And it had completely different innards and battery capacities. Just grabbing that old battery and putting it in a new phone would seriously limit the runtime on a single charge. Which is kinda the point, I really hope we don't trade replaceable batteries for the need to recharge twice a day or switch batteries to even make it the whole day. Or have a noticeable bulkier phone that won't fit as comfortably in my pocket. Or that it may not survive the rain shower I got surprised by because they skimped on the water proofing.